. Bulletin of the Department of Agriculture. Agriculture; Agriculture. ^wwJXm \ r8 to 10 inches. Cross section of completed road TYPICAL CROSS SECTIONS SHOWING METHOD OF CONSTRUCTING A SAND-CLAY ROAD, USING TOPSOIL OR OTHER NATURAL MIXTURE. "W'should be at least 10 feet for single track road and"S"generally notjess thart 5 feet, for double ;W" should be not less than 14 feet and "S"not less than 3' feet "H" crown, vanes from % to the foot for level grade, to I" to the foot for a grade of 5% Fig. 21. structed vary over a wide range, a
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. ^wwJXm \ r8 to 10 inches. Cross section of completed road TYPICAL CROSS SECTIONS SHOWING METHOD OF CONSTRUCTING A SAND-CLAY ROAD, USING TOPSOIL OR OTHER NATURAL MIXTURE. "W'should be at least 10 feet for single track road and"S"generally notjess thart 5 feet, for double ;W" should be not less than 14 feet and "S"not less than 3' feet "H" crown, vanes from % to the foot for level grade, to I" to the foot for a grade of 5% Fig. 21. structed vary over a wide range, and that any general statements regarding costs may be very misleading when applied to a particular case. In general, for a cost estimate to be at all reliable it should be arrived at by considering the following items: (1) grading and preparing the subgrade, (2) excavating and loading surfacing ma- terial, (3) hauling surfacing material, (4) mixing and shaping surfacing material. Table 8 shows the cost of these items for several different sand- clay roads which have been constructed under the supervision of the Office of Public Roads and Rural Engineering and may be of some assistance in preparing estimates of probable cost for similar projects. As a matter of general information it may be stated that in the Southern States the cost of constructing 16-foot sand-clay. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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